(;LB[hd:6]LB[jd:7]LB[ld:8]C[how many stones in a row on the second line is needed to live no matter what? The group cannot be on two sides: for example: the group can't include A2, B1, S1, T2, S19, T18, B19, or A18.]AP[goproblems]
(;B[hd]C[Let's see... I pass and you are still dead.]AB[fr]AB[gr]AB[hr]AB[ir]AB[jr]AB[kr]AW[er]AW[eq]AW[fq]AW[gq]AW[hq]AW[iq]AW[jq]AW[kq]AW[lq]AW[lr]AW[cr]AW[nr];W[ss]
(;B[fs];W[ks];B[js];W[hs])
(;B[ks];W[fs];B[gs];W[is])
(;B[hs];W[fs])
(;B[is];W[ks]))
(;B[jd]AB[jr]AB[ir]AB[kr]AB[lr]AB[hr]AB[gr]AB[mr]AW[fq]AW[fr]AW[gq]AW[hq]AW[dr]AW[iq]AW[jq]AW[kq]AW[lq]AW[mq]AW[nr]AW[pr]AW[nq];W[ms];B[ls];W[gs];B[hs];W[js]C[dead])
(;B[ld]AB[jr]AB[kr]AB[lr]AB[mr]AB[ir]AB[hr]AB[gr]AB[fr]AW[er]AW[fq]AW[eq]AW[gq]AW[hq]AW[iq]AW[cr]AW[kq]AW[jq]AW[lq]AW[mq]AW[nr]AW[nq];W[fs]
(;B[gs]
(;W[ms];B[ls]C[straight four: alive!RIGHT])
(;W[is];B[ms]C[RIGHT]))
(;B[ms]
(;W[ks]
(;B[gs]C[RIGHT])
(;B[js]C[RIGHT]))
(;W[gs];B[hs]C[RIGHT]))
(;B[js];W[ms];B[ls];W[gs];B[hs]C[RIGHT])
(;B[is];W[gs])))